Lathe



July 5 1927.

H. w. M5L-LING l LATHE a Filed Dec; 1o. 192e s sheets-sheet' 1 Y v /NVENTOR BY Herma/7 W /V/'f/l//vol 6% .M

A TTU/NE YS H. WQMELLING LATHE July 5, '1927. 1,634,550

Filed Deo.1o. 1925 s sheets-sheet 5 /N VENTO/e Patente-July 5, 1927.

'd ...nannten W. Mamme, oamcKsoN, MICHIGAN.

j terrain.

l Application filed December 1051926. Serial No. 158,855.

My improvements relate to lathes of the'r class illustrated i'n 'my ap lication Vfor Let-v ters Patent SerialNo. l116', 50, filed October The main objects of this invention are: First to provide an improved lathe for the turning of non-circular forms such as cams.

Second,.to. provide an improved pattern reproducing lathe by means of which noncircular forms such as cam shafts may b rapidly and accurately reproduced. Third, to provide an-improved lathe `having these advantages which is of large capacity and .largely automatic'in its Ioperation.

Objects pertaining to details and economies of .my invention will definitely 'appear from the detailed description to follow. The invention isclearly dened andpointed out in the claims.

A structure embodying .the features of my invention is clearly illustrated in the accompanying drawing forming a part of this applicatiomin which: v 0

Fig. 1 is a detailfront perspective vlew of a structure embodying the features of my invention.'

Fig. 2 is a ldetail view partially trans- "verse section on aline corresponding toline front elevation. oflone .of thev Fig. 3 is a tool carriages. f Y v Figs. 4, 5, 6, 7 and 8 lare detail views illus' trating the relative relation of the master caml to its coacting abutment on the tool carriage and the tool to the work in several of the positions of these parts during operation thereof. i

Referring to the drawing, thevbedl ofthe machine is provided with a way 2 for/ the work carriagefi. The work carriage is mounted on this'way forlongitudinal and lateral movement and carries the chuck for the work, means being provided for rotating the work and for feeding the carriage. A As such means form no part of my present invention and as they lare described and claim-l ed in Letters Patent Nal-11,512,995, issued to me October 28, 1924,;i1wdffnot illustrate or describe the same in detail herein;

The bed of the machine is valso provided with ways for a plurality of tool carriages 4, a carriage vbeing provided for each cam to be cut. These tool carriagesfl are mount ed for reciprocating movement transversely to theiaxis of the work 5. As'the carriages are rduplicates a description of one will suffice.

The carriage lis urged toward the work by means of the spring 6, an'adjustingscrew f 7 being provided for adjusting the tension The carriage is provided of the spring. Y with an 'abntmentroller 8, the journal 2 of whichv is mounted on an adjustable block 10, this block being adjusted by means ci the screw 11. -A spring pressed detent 12 is provided for vholding thel screw 11 in its ad- Justed position.

The abutment roller coacts with the masillustrated is designed for the turning of the several cams ofa camk shaft for an autol/mobile'engine The cam 13 is one ofthe several cams of a cam shaft 14 which may be a cam shaft taken from stock or which is a replica of the cam shaft tobe reproduced.

It will be observed that the master cam 13 controlling the reciprocation of the carriage isdisposed in an opposed relation to the spring 6, that is, while the spring 6 urges the carriage to Jthe work, the master cam reciprocates the carriage against this spring, thereby preventing ,the tool from taking more than a cut of the desired depth; that is, theA tool cannot hog into the work.I

The tool 15 is mounted on a holder 16y for oscillatingmovement in a. plane'transverse to the axis of the work and is hon-tiltable as .distinguished from the pivotally mounted The link 17 is provided with a rearwardly v and upwardly projecting arm 23 carrying aroller 24 coacting with the cam 25, there being one. of the cams 25 for each unit or tool carriage. -The several Vcams '25 are mounted on a cam shaft 26. The spring 27 holds the roller 24 against the cam.

The cam 25 is rotated in synchronism with the rotation of the master cam 13 and the work so that the tool is oscillated or reciprocated in a plane transverse to the axis of the work as the tool' carriage is reciprocated.

The cam 25 is so conformed that the point of thev tool is caused to engage the Work at.

a point corresponding to the point of contact of the master cam With the abutment roller. The links are arranged so that the radius in which the point of the tool travels corresponds to the radius of the abutment roller. The result is that Work which is a replica of the pat-tern or master,cam is produced.

In Figs. 1l to 8, inclusive, I illustrate the master cam in various positions relative to the abutment roller and also the tool in corresponding positions occupied by it. It will be observed that the point of contact of the abutment roller moves in a vertical plane as the master cam revolvesvw this being a plane through the axis of the abutment roller, the master cam and the Work. The point of the tool is maintained in the same plane as the point of contact of the abutment roller and the Work and is caused to travel or describe a path corresponding` to that at the point of contact of the master cam and abutment roller, this resultingr as stated in the reproduction of the pattern.

Structures embodying,1r my improvements are of large capacity, and strong' and durf able, requiring a minimum of attention in operation.

Having thus described my invention what I claim as nen7 and desire to secure by LettersPatent is:

l. In a structure of the class described, the combination of a Work carriage, means for rotatably supporting the Work onsaid carriage, a tool carriage reciprocating laterally of said Work carriage, a'master cam which is a replica in shape of the Work to be cut,

1 an abutment roller on said tool carriage coacting With said cam` a tool, a tool holder, a pair of links on which said ltool holder is pivotally mounted on said carriage in paral- ,lel relation, one of said links being provided with an arm, a cam coactlng With 'said arm whereby said tool holder is oscillated in a plane transverse to the axis ,of the Work and lthe cutting;r edge of the tool in relation to the Work corresponds with the point of contact of the master cam With the abutment roller, and means for driving' the Work and the master cam at-the same speed.

2. In a structure of the class described,

,the combination of a Work carriage, means for rotatably supporting,r the Work on said carriage, a tool carriage reciprocating laterally of saidjvork carriage, a master cam which is a replica in shape of the Work to be cut, an abutment coacting With said cam, a tool, a tool holder, a pair of parallel supporting' links on which said tool holder is pivotally mounted, means for oscillating said links whereby said tool holder is oscillated in a plane transverse to the axis of the Work and the cuttingedge of the tool in relation tothe Work corresponds With the point of contact of the master cana with the abutment, and means for driving the Work and the master cam at the same speed.

3. In a structure of the class described, the combination of means or rotatably supporting` the Work a tool carriage provided with a cam abutment roller, a pattern cam which is a replica in shape orn the Work to be cut `coacting ,with said abutment roller t0 reciprocate said carriage, a tool, a tool holder, a support therefor comprising a pair of parallel links pivotally mounted on'said carriage, one of said links being provided with an arm, a cam coacting with said arm.

whereby said tool holder is oscillated transversely to the axis Aof the Work and so that the cutting` point of the tool engages the Work at a point corresponding` to the point of contact of the master cam with said abutment., and means for driving the Work-and the pattern cam in synchronism.

4. In a structure of the class described, the combination of a rotary Work holder, a reciprocating tool carriage, a master cam corresponding in shape to the Work to be cut, an .abutment on -said carriage coasting With said master cam, a tool, a tool holder non-tiltably mounted on said carriage for -reciprocr-.ting movement in a plane transverse to the axis of the Work, and means for reciprocatinpT saidtool holder so that the path of travel described by the cutting' edge of the tool corresponds with that at the point of contact of the vmaster cam and abutment.

In a structure of the class described, the combination of a rotary Work holder, a recipro-ating tool carriage, a master cam corresponding in shape to the work to be m hand.

y HERMAN W. MELLING. 

